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rotate: fix crash when image origin is not (0,0)

--- a/sys/src/cmd/rotate.c

+++ b/sys/src/cmd/rotate.c

@@ -41,7 +41,8 @@

 	dx = Dx(m->r);

 	dy = Dy(m->r);

-	if((w = allocmemimage(Rect(m->r.min.x, m->r.min.y, dy, dx), m->chan)) == nil)

+	if((w = allocmemimage(Rect(m->r.min.x, m->r.min.y, 

+		m->r.min.x+dy, m->r.min.y+dx), m->chan)) == nil)

 		sysfatal("allocmemimage: %r");

 	line = w->width*sizeof(ulong);

 	for(y=0; y<dy; y++){

-- 

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